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copied!<p>This wasn't as trivial as I thought. <s>Probably the most sane solution (aside from building the list recursively) is to implement a comparer for this to do the sorting.</s></p> <p><s><pre> class DirectorySorter : IComparer<string> { public int Compare(string x, string y) { return StringComparer.Ordinal.Compare(x.Replace(Path.DirectorySeparatorChar, '\0'), y.Replace(Path.DirectorySeparatorChar, '\0')); var xPaths = x.Split(Path.DirectorySeparatorChar); var yPaths = y.Split(Path.DirectorySeparatorChar); var minLength = Math.Min(xPaths.Length, yPaths.Length); for (int i = 0; i < minLength; i++) { var ires = xPaths[i].CompareTo(yPaths[i]); if (ires != 0) return ires; } var lres = xPaths.Length.CompareTo(yPaths.Length); if (lres == 0) { return lres; } else if (lres < 0) { var i = y.LastIndexOf(Path.DirectorySeparatorChar); return x.Length == i ? lres : -lres; } else //if (lres > 0) { var i = x.LastIndexOf(Path.DirectorySeparatorChar); return y.Length == i ? lres : -lres; } } } </pre> </s></p> <p>(Seeing Steck's answer shows that I was nearly there with what I originally had. Just that I needed to use the Ordinal string comparer. So it turns out it works using that change.)</p> <p>On the other hand, we could use some properties of the directory structure to simplify this task and not implement a comparer.</p> <pre><code>var query = Directory .EnumerateDirectories(@"D:\Project\uploads", "*", SearchOption.AllDirectories) .OrderBy(name => name.Replace(Path.DirectorySeparatorChar, '\0'), StringComparer.Ordinal); </code></pre>

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